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[95.90.166.134]) by smtp.gmail.com with ESMTPSA id m14sm28290709wrp.28.2021.11.17.05.49.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 17 Nov 2021 05:50:00 -0800 (PST) From: Varad Gautam X-Google-Original-From: Varad Gautam To: kvm@vger.kernel.org Cc: pbonzini@redhat.com, drjones@redhat.com, zxwang42@gmail.com, marcorr@google.com, erdemaktas@google.com, rientjes@google.com, seanjc@google.com, brijesh.singh@amd.com, Thomas.Lendacky@amd.com, jroedel@suse.de, bp@suse.de, varad.gautam@suse.com Subject: [RFC kvm-unit-tests 09/12] x86: AMD SEV-ES: Handle RDTSC/RDTSCP #VC Date: Wed, 17 Nov 2021 14:47:49 +0100 Message-Id: <20211117134752.32662-10-varad.gautam@suse.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20211117134752.32662-1-varad.gautam@suse.com> References: <20211117134752.32662-1-varad.gautam@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Using Linux's RDTSC #VC processing logic. Signed-off-by: Varad Gautam --- lib/x86/amd_sev_vc.c | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) diff --git a/lib/x86/amd_sev_vc.c b/lib/x86/amd_sev_vc.c index 91f57e0..45b7ad1 100644 --- a/lib/x86/amd_sev_vc.c +++ b/lib/x86/amd_sev_vc.c @@ -153,6 +153,29 @@ static enum es_result vc_handle_cpuid(struct ghcb *ghcb, return ES_OK; } +static enum es_result vc_handle_rdtsc(struct ghcb *ghcb, + struct es_em_ctxt *ctxt, + unsigned long exit_code) +{ + bool rdtscp = (exit_code == SVM_EXIT_RDTSCP); + enum es_result ret; + + ret = sev_es_ghcb_hv_call(ghcb, ctxt, exit_code, 0, 0); + if (ret != ES_OK) + return ret; + + if (!(ghcb_rax_is_valid(ghcb) && ghcb_rdx_is_valid(ghcb) && + (!rdtscp || ghcb_rcx_is_valid(ghcb)))) + return ES_VMM_ERROR; + + ctxt->regs->rax = ghcb->save.rax; + ctxt->regs->rdx = ghcb->save.rdx; + if (rdtscp) + ctxt->regs->rcx = ghcb->save.rcx; + + return ES_OK; +} + static enum es_result vc_handle_exitcode(struct es_em_ctxt *ctxt, struct ghcb *ghcb, unsigned long exit_code) @@ -166,6 +189,10 @@ static enum es_result vc_handle_exitcode(struct es_em_ctxt *ctxt, case SVM_EXIT_CPUID: result = vc_handle_cpuid(ghcb, ctxt); break; + case SVM_EXIT_RDTSC: + case SVM_EXIT_RDTSCP: + result = vc_handle_rdtsc(ghcb, ctxt, exit_code); + break; default: /* * Unexpected #VC exception -- 2.32.0